Bag sewing machine



1936- o. WEBER ETAL ,05 I

BAG SEWING MACHINE Filed Oct. 31, 1933 sheets-sheet 1 Ottv TVber:

Albert Ofi/aermann,

" Zltbr/Leq Aug. 18, 1936.

o. WEBER Er AL BAG SEWING MACHINE Filed Oct. 31,1933 :5 Sheets-Sheet 2 .AZ brt Qqbermann,

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Aug. 18, 1936. o. 'WEBER' ET AL BAG SEWING MACHINE Filed Oct. 31, 1933 3 Sheets-Sheet :5

Inuantfons, Otto VVbe-rt v,JZbL-Jb Oppa mum Patented Aug. 18, 1936 STAS PAET orrie BAG SEWING MACHINE zerland Application October 31, 1933, Serial No. 696,073 In Germany August 2, 1933 12 Claims.

Our invention relates to improvements in bag sewing machines, and more particularly in bag sewing machines comprising a frame adapted to be placed on the filled bag and to stretch the rim of the bag, and to have the sewing apparatus placed thereon. More particularly our invention relates to the construction of the frame and cooperating parts of the sewing apparatus, and the object of the improvements is to provide a frame which is adapted to clamp the rim of the bag between the same. Another object of the improvements is to provide a light frame which may be manufactured at low cost. With these objects in view our invention consists in constructing the said frame in the form of a pair of hinged plates adapted to be placed on the rim of the bag and to clamp the same, the said plates being formed with longitudinal slots adapted to be engaged by parts of the sewing apparatus.

For the purpose of explaining the invention an example embodying the same has been shown in the accompanying drawings in which the same reference characters have been used in all the views to indicate corresponding parts. In said drawings,

Fig. l is an elevation showing the sewing machine, the sewing apparatus being placed on the frame and the frame clamping the rim of the bag between its plates,

Fig. 2 is a side elevation viewed from the left in Fig. 1,

Fig. 3 is a fragmentary elevation showing the frame,

Fig. 4 is a sectional elevation taken on the line 4-4 of Fig. 3,

Fig. 5 is an elevation partly in section showing the bottom part of the sewing apparatus,

Fig. 6 is a diagrammatical elevation showing the top part of a filled bag having the frame of the sewing machine placed thereon for clamping the rim between the plates, the said figure illustrating the first step of the method of placing the frame on the bag,

Fig. 7 is a fragmentary elevation showing a tool used in the operation of clamping the bag between the plates of the frame,

Figs. 8, 9 and 10 are diagrammatical eleva tions illustrating the second, third and fourth steps of the method of placing the frame on the bag.

Fig. 11 is a fragmentary plan view of Fig. 1,

Fig. 12 is a sectional elevation similar to the 55 one illustrated in Fig. 4 and showing a modifica tion of the frame, the said figure being a section taken in the line l2-l2 of Fig. 13, 1

Fig. 13 is a fragmentary elevation viewed from the left in Fig. 12 and showing one end of the frame,

Fig. 14 is an elevation similar to the one illustrated in Fig. 12 and taken on the line i l-I l of Fig. 15, and

Fig. 15 is a fragmentary elevation similar to the one illustrated in Fig. 13v and showing the 10 other end of the frame.

The bag sewing apparatus does not form a part of the present invention and I believe that a brief description of the said apparatus is sufficient. But for detail information reference may be had to the application for U. S. patent Ser. No. 666,002, filed April 13, 1933.

Referring at first to Figs. 1 and 2, the sewing apparatus comprises an electric motor 25 mounted on a frame comprising four legs 1 supported .2 on pairs on shoes I6. The frame includes arms 21 formed with eyes 28 in which a rod 29 is slidable. To the rod a needle holder 30 is secured which carries a needle 31. The needle holder 30 is connected by a link 32 with a crank disk 33 22, connected by means of a gearing (not shown) with the shaft of the electric motor 25. Thus from the said shaft reciprocating movement is imparted to the needle 3L. From the frame an arm 34 is directed downwardly which is formed." with a thread hole 35, and to the said thread hole the thread is supplied from a spool 36 mounted on brackets 31 secured to the casing of the electric motor, the said thread being trained on a roller 38. To the case of the motor 435 a handle 39 is secured which is formed with a switch 40 controlling the supply of electric energy to the motor.

The sewing apparatus is adapted to be placed on a frame which has been illustrated in Figs. 3 to' 11, and which comprises two plates I hinged .to each other along their top margins at 2. v To the free ends of the said plates rails 4 are connected by means of hinges 3 which rails provide supports for the shoes 16, as is shown in Fig. 1.

-The plates I are formed with longitudinal slots 5 extending substantially the whole length thereof and providing guides for spring-pressed bolts amounted on the legs I, and also permitting the passage'of the needle through the same, as will be described hereinafter. At one of their ends the plates I are each provided with an extension providing a handle 14. The bolts 6 are shiftably mounted in sleeves 8 mounted on the legs 1. Near their inner ends the'bolts carry collars 9, and each bolt has a pin or lug I0 between the collar and its bearing 8, said pin coacting with a cam I I secured to a shaft I3 mounted on the legs I, the said shaft being adapted to be turned by means of a crank arm I2.

If it is desired to close a filled bag by sewing the rim thereof, the rails 4, 4 are rocked upwardly from the position of Fig. 4, and the said plates are brought into fiat position, as shown in Fig. 6 whereupon the frame is placed on the filled bag at one side of the upwardly directed rim :1: thereof, as is shown in said figure. Now the rim :1: is folded downwardly and into the position shown in Fig. 6 in dotted lines so that it covers the frame provided by the plates I and the rails 4. The outer section of the frame I, 4 is now folded upwardly together with the rim 3:, and a cleat I6 formed with a handle I5 and having a length equal to that of the plates I is placed on the rim :1: so as to hold the same in engagement with the plates I. After the rim :1: and the frame I, 4 have thus been folded-together the cleat I6 is retracted in the direction of the arrow 1/ shown in Fig. 9, and the plates I and the rim w clamped between the same are turned upwardly and into the position shown in Fig. 10, whereupon the rails 4 are turned downwardly and on the top of the filled bag.

After the frame and bag clamping device I, 4 has thus been brought into position, the'bolts 6, 6 are retracted from each other by turning the shaft I3 and the cams II by means of the crank arm' I2, and the sewing apparatus is'placed on the frame I, 4 with the shoes I6 bearing on the rails 4, whereupon the said cams are turned backwardly for permitting the bolts 6 to be pushed into engagement with the longitudinal slots 5 by coiled springs 6 acting on said bolts 6, until the collars 9 bear on the outer faces of the plates I and press the same on the rim.

After the sewing apparatus has been started it is shiftedon the rails 4, while the needle passes through the slots 5 and closes the rim at. The bolts 6 prevent the sewing apparatus from being prematurely removed from the frame, so that the needle is not broken by striking its point against a plate I. The sewing apparatus may 'be removed only after the bag has been closed and after the crank arm I 2 has been operated for retracting the. bolts 6.

Finally the sewing apparatus is removed from the frame I, 4 and the plates I and therails 4 are folded away from the rim and removed from thebag.

.Preferably the plates I are provided at their inner and upper faces with cleats I! which are formed at their opposing faces with interengaging wave-like surfaces, and on the inner faces of the plates I, I corresponding holes' I8 and pins I9 are provided, the said pins being passed through the rim of the bag when the frame I, 4 is placed thereon for clamping the rim together.

In'orderto insure that the rim portions or upper margins'of the sack will be held safely in place between the plates I there can be formed on the inner faces of the place corrugations I'I.

As shown in Fig. 11 such corrugations are preferably vertically extending wave like ribs, so formed on their respective plates that the ribs on one plate engage between those of the other.

In addition to the corrugations there may be provided pins'I9 on one plate arranged to enter openings I8 in the other.

In the modification shown in Figs. 12 to 15 the plates 5I are provided at the ends of and above the slots 55 with beveled faces 20 and 2|, the said faces 20 located at one end being inclined upwardly and inwardly, and the faces 2I being inclined upwardly and downwardly. When the sewing apparatus is placed on the frame with its 5 bolts 6 in position for engaging the beveled faces 20 the said beveled faces force the bolts 6 outwardly, whereupon they pass into the slots 55, and when, after sewing, the bolts arrive at the opposite ends of the slots 55 they are in position for engagement with the beveled faces 2|, so that the sewing apparatus may be moved upwardly, the beveled faces 2| forcing the bolts 6 outwardly. In this modification the cams I I may be dispensed with.

At one of the ends of the frame I, 4 a stop 23 may be provided which prevents the sewing device from being moved with the needle beyond the slots 5.

We claim:

. 11A bag sewing machine comprising a frame adapted to be placed on a filled bag and providing tracks atboth sides of its neck arranged to rest on the shoulders of a filled sack, upstanding clamp plates carried by said track members for holding the top of a bag, and a sewing machine adapted to be placed and guided on said tracks, said plates having holes for the passage of the needle of said machine.

.2; A device as in claim 1, said plates being each 30 pivoted to' a track member and being movable independently of said tracks.

3. A bag sewing machine, comprising a frame adapted to be placed on the filled bag and including a pair of plates hinged to each other along 35 their upper margins and a pair of rails hinged to the lower margins of said plates, and a sewing apparatus adapted to be placed and guided on said rails, said plates being formed with holes for the passage of the needle therethrough.

4. In a sewing machine, the combination, with a frame comprising two plates hinged to each other along their'upper margins and formed with slots extending substantially the whole length of the plates and rails hinged to the lower margins of said plates and adapted to be folded upwardly onto said plates, of a sewing apparatus adapted to be placed and guided on said rails with the needle in position for passing through said slots, and spring-pressed bolts on said sewing apparatus adapted to engage said slots.

5. In a bag sewing machine, the combination, with the sewing apparatus, of a frame adapted to be placed on the filled bag and to provide a support for said sewingapparatus, said frame comprising a pair of plates hinged to each other along ,their upper margins, said plates being adapted to clamp the rim of the bag between them and being formed with longitudinal slots extending .sub-

-stantially the whole length of the plates, rails 60 .hinged to the lower margins of said plates and adapted to be folded onto the plates and when folded away from said, plates to provide guides for said sewing apparatus, and spring-pressed bolts on said sewing apparatus formed near their 65 inner ends with collars, said bolts and collars being adapted to engage respectively said slots and the margins thereof.

6. In a bag sewing machine, the combination, with the sewing apparatus, of a frame adapted 70 to be placed on the filled bag and including a pair of plates hinged to each other along their .upper margins and said plates being adapted to clamp the rim of the bag between the same and being formed with slots extending substantially $.75

the whole length of said plates, spring-pressed bolts mounted on said sewing apparatus in position for engaging said slots, and cams on said sewing apparatus in position for retracting said bolts away from each other.

7. In a bag sewing machine, the combination, with the sewing apparatus, of a frame adapted to be placed on the filled bag and including a pair of plates hinged to each other along their upper margins, said plates being adapted to clamp the rim of the bag between them and formed with slots extending substantially the whole length of said plates, spring-pressed bolts mounted on said sewing apparatus in position for engaging said slots and formed near their inner ends with collars adapted to bear on the outer faces of said plates for forcing the same together, and handoperated cams acting on said bolts and adapted to retract the same away from each other.

8. In a bag sewing machine, the combination, with the sewing apparatus, of a frame adapted to be placed on the filled bag and comprising a pair of plates hinged to each other along their upper margins and formed with slots for the passage of the needle therethrough, said slots extending substantially the whole length of the plates, and spring-pressed bolts on the sewing apparatus adapted to engage said slots for holding the sewing apparatus on said frame, said plates being formed near their ends with bevelled faces which are inclined at the opposite ends of the slots upwardly and inwardly and upwardly and outwardly respectively, and being located in position for engaging said bolts for pushing the same outwardly when the sewing apparatus is placed on or removed from said frame.

9. A bag-sewing apparatus comprising a sewing machine, a frame adapted to rest on a filled bag and to be supported thereby, said frame comprising a pair of rails with horizontal faces along which the sewing machine is moved manually, said frame also including a pair of clamping plates extending in vertical planes between said rails for holding the rim of the bag each clamping member having a longitudinally extending needle-receiving slot for a distance at least equal to the width of the bag to be closed, and said sewing machine including means for holding the clamping members in operative position during its travel along said rails.

10. A bag-sewing apparatus comprising a sewing machine, a frame adapted to rest on a filled bag and to be supported thereby, said frame comprising a pair of rails with horizontal faces along which the sewing machine is moved manually, said frame also including a pair of clamping members located between said rails for holding the rim of the bag each clamping member having a longitudinally extending needle-receiving slot for a distance at least equal to the width of the bag to be closed, said sewing machine including means for holding the clamping members in operative position during its travel along said rails, the clamping devices being formed as plates hinged together at adjacent edges, and the supporting rails being each hinged to a remote edge of one of said plates.

11. A bag-sewing apparatus comprising a sewing machine, a frame adapted to rest on a filled bag and to be supported thereby, said frame comprising a pair of rails along which the sewing machine is moved manually, said frame also including a pair of clamping members located between said rails for holding the rim of the bag each clamping member having a longitudinally extending needle-receiving slot for a distance at least equal to the Width of the bag to be closed, said sewing machine including means for holding the clamping members in operative position during its travel along said rails, the rails and clamping members being parallel to one another, the clamping members being hinged together at adjacent inner edges and the rails being hinged to the outer edges of said clamping members.

12. A bag-sewing apparatus comprising a sewing machine, a frame adapted to rest on a filled bag and to be supported thereby, said frame comprising a pair of rails along which the sewing machine is moved manually, said frame also including a pair of clamping members located between said rails for holding the rim of the bag each clamping member having a longitudinally extending needle-receiving slot for a distance at least equal to the width of the bag to be closed, said sewing machine including means for holding the clamping members in operative position during its travel along said rails, and guiding elements on the sewing machine adapted during the sewing operation to engage in the slots provided in the clamping members for passage of the needle and thus to guide the sewing machine in its travel.

OTTO WEBER. ALBERT OPPERMANN. 

